John -- breaking news of the White House John. George we've had quite a scare here at the white house with. What appeared to be shots fired up front turned out simply to have been firecrackers. But this happened while we were getting set up to -- come on the show outside. And we heard two loud pop sound what sounded like too loud pops. Looked over and I saw three Secret Service officers. Going over and tackling a man right outside the fence on the north lawn of the White House the gentleman was wearing shorts barefoot. No idea what he was up to but he was tackled right to the ground by the Secret Service officers. And he was taken away the White House put on lockdown we were told to come inside but I have been told that this was simply. Somebody for what ever reason throwing firecrackers over the fence of the north lawn of the White House especially on this stage you can imagine it is something that caused quite a scare here at the White House but now looks like nothing to worry we have an all clear. And Jon Karl thanks very much you can to pops and then tackled by the Secret Service.

This transcript has been automatically generated and may not be 100% accurate.